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ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS
Period for advance rental payment	1 month
Amount received for prepaid rent	$ 1,405,000
Security deposits	$ 1,953,000	$ 1,879,000

X

- Details

Name:	nen_AdvanceRentalPaymentsAndSecurityDepositsDisclosureAbstract
Namespace Prefix:	nen_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for which tenant may be required to pay rent in advance.

+ References

No definition available.

+ Details

Name:	nen_PeriodForWhichRentToBePaidInAdvanceByTenant
Namespace Prefix:	nen_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents amounts received from tenants for prepaid rents which are included in cash and cash equivalents.

+ References

No definition available.

+ Details

Name:	nen_PrepaidRentReceivedIncludedInCashAndCashEquivalents
Namespace Prefix:	nen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SecurityDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant